The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 2024
Filed:
Aug. 11, 2023
SK Innovation Co., Ltd., Seoul, KR;
SK Geo Centric Co., Ltd., Seoul, KR;
Kolon Industries, Inc., Seoul, KR;
Do Young Kim, Daejeon, KR;
Hyun Sik Yang, Seoul, KR;
Yu Hyun Kim, Seoul, KR;
Ki Yup Kim, Daejeon, KR;
Joo Hyun Nam, Daejeon, KR;
Chul Soon Moon, Daejeon, KR;
Ji Hae Park, Daejeon, KR;
Sung Won Lee, Daejeon, KR;
Jun Haeng Lee, Daejeon, KR;
Ho Seung Lee, Daejeon, KR;
SK Innovation Co., Ltd., Seoul, KR;
SK Geo Centric Co., Ltd., Seoul, KR;
Abstract
Provided are a biodegradable aliphatic-aromatic polyester copolymer having excellent hydrolysis resistance and high viscosity which has a carboxyl end group (CEG) content of 15 mg KOH/g or less, a ratio (Mz/Mn) of a z-average molecular weight (Mz) to a number average molecular weight (Mn) of 3 to 15, and a melt index (MI) of 5 g/10 min or less as measured under conditions of a temperature of 190° C. and a load of 2.16 kg in accordance with ASTM D 1238. A method of preparing a biodegradable aliphatic-aromatic polyester copolymer is provided, including adding a chain extender and an anti-hydrolysis agent to an aliphatic-aromatic polyester pre-copolymer over time, whereby a significant viscosity rise and improvement of hydrolysis resistance may be implemented simultaneously.